I have tried for 30 minutes trying to get the graphs on here. I have them on my comp. I'll stop by and show you them on Tuesday. I'm sorry that I couldn't figure out how to get it on here! :(

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The 2009 Nissan Sentra 4-door SR FE Plus Sedan

The Standard / Optional Equipment associated with the Nissan Sentra are:

Equipment (Alphabetically)	Details
Air Conditioning	Standard
Alarm System	Standard
Alternator	100-Amp
Axle Ratio	2.69
Battery	650-cca
Brakes	Power Front Disc
Braking System	Anti-Lock
Clock	Digital (w/Radio)
Console w/Covered Storage	Standard
Cup Holders	(4)
Defroster	Rear Window
Door Locks	Automatic Power
Drivetrain	FWD
Engine	4-Cyl, 2.0 Liter
Engine Immobilizer	Standard
Entry System	Keyless Remote Control
Fuel Filler Door Release	Remote Control
Fuel Tank	14.5 Gal Cap
Light	Cargo Comp't
Lights	Console, Daytime Running & Reading
Mirrors	Dual Power & Dual Visor Vanity
Power Outlets	(2)
Radio	AM/FM Stereo w/CD
Radio Equipment	Auxiliary Input
Restraint System	Dual Front, F&R Head Curtain & Front Side Impact Air Bag
Seat	Split Folding Rear
Seats	Cloth Bucket
Speed Control	Standard
Spoiler	Rear
Stabilizer Bars	F&R
Steering	Variable Assist Power
Steering Wheel	Tilt
Steering Wheel Touch Controls	Standard
Tachometer	Standard
Tire	Limited Use Spare
Tire Pressure Monitor	Standard
Tires - F&R	P205/55HR16
Transmission	Automatic, CVT
Trip Computer	Standard
Trunk Entrapment Release	Standard
Trunk Release	Remote Control
W/S Wipers	Variable Intermittent
Wheels	Alloy
Windows	Power

The 2009 Nissan Sentra SR FE is a 4-cylinder gets 26 miles per gallon in the city and 34 miles per gallon on the highway.
The car is an automatic and has four doors. It is a midsize car and will seat five people.
There are five different air bag places (Driver, Head/ Curtain, Passenger, Rear Curtain, and Side)

Retail / Dealership Trade-In Value

Year	Retail Value	Dealership Trade-In
2009	$18,480	N/A
2008	$18,015	$13,755
2007	$16,995	$12,475
2006	$12,800	$8,550
2005	$11,935	$7,825

Exponential Equation for the Age of Car (in years) and the Retail Price: y = 27,173.09275 (0.8854859234^x)

Exponential Equation for the Age of Car (in years) and the Dealership Trade-In Value of the Vehicle:

y= 2131.85768 (.8130171026^x)

I would buy a new Sentra as soon as possible before the economy gets any worse. It would be much easier paying for a new car if the economy was not too horrible yet. I would take very good care of the car and make sure everything stays up to date and is fixed, that way it will last a long time and you would not have to trade. If i was going to trade I would keep the Nissan Sentra at least full five years before i traded it in. I would do this because a Sentra seems to hold its value fairly well, as long as it is kept in excellent condition. The Nissan Sentra usually can get 300,000 miles (they say) so it is a very dependable and reliable car, even if it isn't a brand new one.